Electric furnace



Jan. 30, 1923.

ELECTRIC FURNACE.

HLED JAN. I3, 1321.

Jan. 30, 1923.

F. A. 1. m2 GERALD.

ELECTRIC FURNACE.

2 SHEETS-SHEET 3.

FILED JAN-13,192]- (min a single phase are; It is Well known.

- Patented J an. 3G,' 1923.

- UNITED STAT-E FRAJICIS A; J. FITZ GERALD,

. 0F BUFFALO, NEW YORK,

s PATENT OFFICE;

ELECTRIC FURNACE.

- Application filezt January w, 1921. 'Serial Nb. 436,917.

liuiv l'orlr. nave invented certain new and usefulImprovements in Electric Furnaces, m" which the 'Foilmving' is a full, clear, and exuct desuriptiom v My in vont i on relnt es of tlw arc typo which is heated by radiation that. u; furnaces of this type the arr is formed between two opposing rurbon Bloc: trodus. i nave found that it is very impon tnuixtha'z tlwnlsutrodos be kept in e'xaot ulino; mo n; with caclnother if the furnace to work in a satist'ahtory and efficient manner. it rhi: electrodes are not in aliuen'iont, the. an: drawn between thorn ends unevenly, with the rrsul't that the surfzures at the 0nd of the electrodes will uvsutually lie in planes at nngh's to the vertical (router lino of the iurunoe. This will result in deducting the radiation oi heat produced by the arc; zind,.as thls'detlertion IS many tunes in an upivnrdwlireotioin llltltll loss resuits in rurri-nt consumption.

in providiu my invention. l-hare sought. to overt-nine ihe disadvanlagrs above rnumoratvd and to provide a 'flli'lltll'P-lll whim-h means are provided for nuiintnining the ulm-lrudos in purlvut alinvluvnh .-\nol,hor object has boon to provide a furnacr in which both vim-trodes may ha operated sinulltiuisously, so that the lurrmre muy ho rasily controlled by onc workman.

Another object has boon to provide means whereby one electrode may. he moved iu- 'dopcndoni-l r ofthc othor.

Thu above objects and advantages havo been accomplished by thev device shown in the accompanying drawings, of which:

Fig. 1 is a side elovation of my furnace, partly in section.

Fi 2 soutional, and View of the) sums and is taken on line 3Q of 1.

Fig. 3 is (U1 enlarged, sertionai View taken on line 1323 of Fig. 2.

generally to eleotriu furnaces and more partig-ularly to a turnarowill wear away the.

of bolts :32.

rluting.

guide rod 28. Each of the on liiie 4 -lof ,l1ig. l.

lily furnace comprise;

suitably supported by furnace is p'articul;

' Fig.4 is an enlarged. sectional view taken standards. 11. As m x z'ly adapted for experimental work, these standards may be of our suit-able height and they on a trurk (not shown) walls )2 provide may be mounted -ifdesired. The for enclosing the furnace chamber 13. and these walls are made oi suitablerefractory material. having pref; crahly :1 suitable chamber lini1ig'-l4.- is the'cover for the furnace chamber which is also preferably lined atl6. l7 and 8 are thgplectrodes.which are preferably 0 oarhon. and are passed through z1pe1't-i1res 12) formed through two opposite walls 12 of the furnace chamber. Each of the carbons is suitably nuiunted and'clun'iped in an .electrode holder 20. Each electrode holder is provided. with u rhunp member 21 which is fastened to the elect-rode holder by means The clamp member 21 is provided with an upwardly extending Contact 1i rm 23, whereby the-(able 2st carrying (31th rent; to tha eloctrodo may be suitably 00nuoctod In the elect-rode holder. VEach of the electrode holders is carried at the upper end of an operating arm 25, and is suitably insulated thrrr-irmu as clearly shown in Fig. 4. Standiuds 36 and 27 are provided beneath earl: of the cleotrodes ll and 1S. Thesi-v standards :1 re preferably secured to the base Hand their upper ends are connected tog'othcr by moans of a guid rod :38. An opscrew 29 is rotatably supported by standards at some. distance below the operut-in arms 2:") ispi'tfiviiled with a screw-threade aperture near its lower end for engagement with the operating screw 29 nndfalso with an aperture for registration and sliding engagemont with the guid rod 28. This arrangement keeps the operatingarm in per- :t'ect :dinenwnt and at the some 'nie permits its movement baclnvardly and brwardly.

the.

An operating shaft 30 is suitably mounted and preferalrly attached to the lower side'qof the base 10.

ably two parts 31 and 32 which are connect a base 10 which is This shaft. comprises prefer Meshing with this spur gear is another spun geu| which is rigidly carried b the ope'rutin shaft. ,An operating whee .36, having a iundle 37 is mounted at one end of the operating shaft, whereby the same maybe rotated by the workman. 'One of the op eratin screws 29 is provided with a rightlrnnd l h with a left-hand thread, so that, nswtheolr crating shaft 30 is rotated, the electrodesv will be moved in opposite directions through v the medium of the spur gears and SCREW- threads I n An 'electrode guide ill, (see Flg. 3) leprovided for each of the electrodes 17 end 18. These guides are preferably of meta'l end have a hollow center, thus providing a water space 41. Suitable connections 42 and 43' are provided, whereby. water may be o1rcu-' later through the guide. The guide is pro vidcd with u laterally-extending, hlfiu'cuted own 34 which is carried by the upwardlyprojccting end of the standard 26. The arm 4+ is suitably insulated, as shown .lll 3, Q )lll the standard 26. The slot 45 1n the u zm is slightly wider tlnin the insulated bushing 46 over which it is disposed, so that the guide may be swung sidewise, us well as hin" elevated or lowered -whereb the electrodes may be accurately uhned. bolt 47, also insulated from the standard 26, is provided for clumping each of th electrode gultlrs in its adjusted position. in insulatlug .wwshcr 48 is dis'iosed between the dim 44 of the guide and e standard 26. e

When u crucible is to be uagjd in [Ill tur- Imoc. the electrodes n'mybefaremoved'und granuhururbon packed about the crucible and in the apertures 19. The electrodes may he then placed in the. electrode holden; 2,0 and brought ugainst the runular'carbon, whereby the granular carbon will act an a resistor for heating the crucible; Thee'nnd other modificatons of the details herein shown and described maybe made without departing from the splint of my invention or the scope of the appended claims; and l read and the other one 18 providedslnrlt with theoperutihg screwa.

each holder, an opernti do not, therefore, wish to he limitert'to the .cxact embodiment herein shown and described. the form described being merely a:

' aiwuy from. each other, and a guide for ouch electrode hpared apart from the holder for keeping llieelectmdes in ulinement.

2. An "electric furnace comprising a furnace chumbeuo )positely arranged electrodes. passur through the walls of the chamber, u holrer for euch'lectrmlc; It right-hood operating screw rotatnhly mountr-l below. one electrode, a leftdmnd operatin screwrotatably mounted below the other e ec'trode,

on operating'uml fonconneotufg earhof the ":5

screws with one of the cleetmdcs, in: operating shaft, and means fortconnecting' the 8. An electric furnace compris'tn n .l'urnace chamber, oppositely arranged e eetrodes passing throu h the walls of the chamber, it holder for eat. I electrode, a right-hand opernting screw rotutably 'mminted' belowone electrode, a lefthand operating screw rotatubly mounted below the other electrode, on operating arm forconnecting each of the screws with one of the electrodes, on opernt ing shaft, means for connecting the shaft \v1th= the operating screws, zuul .r uide for each electrode spaced u art from t 1e holder for keeping the elect es in alinement.

4:. An electric furnace comprisin r a .fur-

nace chamber, oppositely arranged e ectrodes passi through .the'walls of the chamber, a. hol er for each 'electrode,'a right-hand operating screw rotatably mounted below one electrode, a left-hen operuti screw rotatsibly mounted below the other ectrode,

an operating arm 'for connecting each of the screws with one of the electrodes, a guide for shaft, and means for connecting the shaft with the operating screws.

In testimony whereof, I signed my name. FRANCIS A. J. FITZ GERALD.

have hereunto 

